This is how drug dealer Kyle Enos attracted customers to his online opiate store, trading drugs for cryptocurrency on the dark web.

He traded in fentanyl, the powerful painkiller that can be 50 times as strong as heroin and which contributed toPrince’s death, by offering customers supermarket-style “buy one get one free” deals in exchange for bitcoin.

The 25-year-old was given an eight-year prison sentence at Cardiff Crown Court on Monday, after he pleaded guilty to importing, supplying, and exporting Class-A drugs.

On Monday, to coincide with his imprisonment, the UK’s National Crime Agency released evidence gathered in their investigation.

It includes the full text of one of his dark web adverts, which Business Insider has reproduced below:

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Enos’s dark web ad.

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National Crime Agency

Police also released footage from Enos’s custody interviews, in which he describes how the drug operation works.

Enos told officers he did not make fentanyl himself, but ordered the substance in bulk every few weeks and sold smaller doses to individual customers. He used his local Post Office in Newport, South Wales, to ship the drug in envelopes.

They communicated anonymously over the dark web, he said, in exchange for bitcoin. The footage does not give any sense of how much money he was making.

Officers also released photographs taken by investigators showing white powder, drugs paraphernalia, and padded envelopes:

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A variety of drugs-related material identified by National Crime Agency workers.

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National Crime Agency

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An evidence photo showing envelopes.

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National Crime Agency

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White powder, photographed next to a pizza box.

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National Crime Agency

The text from Enos’s storefront is in some ways very prosaic – he has a summary of delivery times, offers refunds and guarantees and emphasises the quality of his customer service.

However, the illicit nature of the exchange is also obvious from Enos’s pre-emptive warnings about keeping receipts: Customers needed to be reassured that their information would not be preserved in case Enos were ever caught, which, of course, is exactly what happened.